Warfare Warfare technology is examined, including the Helepolis, a square fortified tower on wheels; and Greek Fire, an incendiary liquid that stuck to people and objects and couldn't be extinguished with water.
Ships The Lake Nemi ships, large Roman vessels that were salvaged from the lake in the 1930s and burned in 1944, are discussed. Included: technological discoveries from the ships.
Machines II Mechanical devices are examined. Included: a small jar that appears to be an electric battery; a flour mill in France run by waterwheels.